Python语言: head.py 输出文件开头的8个字节的二进制表示
最近在写一个在线favicon编辑器，其ico格式很让人不爽，写了个工具生成ico格式的文件
为了手动检查生成结果，写了这个脚本检查其文件头内容：
Python语言: head.py 输出文件开头的8个字节的二进制表示
#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# Recently I start to write an ico file maker
# this script helps on analyze the file header
#
# Usage:
# head xxx.ico - output 16 bytes
# head xxx.ico 32 - output 32 bytes
#
import sys
f = open(sys.argv[1], "rb")
L = 16
if len(sys.argv) >= 3:
L = int(sys.argv[2])
bytes = f.read(L)
for i in range(0, len(bytes), 8):
print bytes[i:i+8]
# -*- coding: utf-8 -*-
#
# Recently I start to write an ico file maker
# this script helps on analyze the file header
#
# Usage:
# head xxx.ico - output 16 bytes
# head xxx.ico 32 - output 32 bytes
#
import sys
f = open(sys.argv[1], "rb")
L = 16
if len(sys.argv) >= 3:
L = int(sys.argv[2])
bytes = f.read(L)
for i in range(0, len(bytes), 8):
print bytes[i:i+8]
xbytes = ["%02x" % ord(b) for b in bytes]
print
for i in range(0, len(bytes), 8):
print "x " + " ".join(xbytes[i:i+8])
def to_bits(b):
bs = []
while b:
bs.append(b&1)
b>>=1
bs = map(str, bs)
bs.reverse()
return "".join(bs).zfill(8)
bits = [to_bits(ord(b)) for b in bytes]
print
for i in range(0, len(bytes), 8):
print "b " + " ".join(bits[i:i+8])
